entrance lock

[′en·trəns ‚läk]

(civil engineering)

A lock between the tideway and an enclosed basin made necessary because the levels of the two bodies of water vary; by means of this lock, vessels can pass either way at all states of the tide. Also known as guard lock; tidal lock; tide lock.

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References in periodicals archive ?

Police said the perpetrators entered the enclosed area by cutting the entrance lock.

News in brief

The entrance lock measures about 12 metres by 50 metres, and the dock covers about 5,000 square metres.

Major archaeological dig for X-museum site; EXCLUSIVE Historic lock gates to be unearthed

At the Blackwall end of the West India Dock, next to the old entrance lock is Cold-harbour, a narrow cobbled lane that runs parallel to the river and loops round to the later entrance lock in the South West India Dock.

Gone to the docks: David Carpenter recalls the vanished world of the London docks in the 1950s

Princess Elizabeth and Lieutenant Philip Mountbatten, aboard the Mersey Docks & Harbour Board's steam tender Galatea with two large loudspeakers perched on the bow, open Liverpool Docks' new Waterloo entrance lock on May 30, 1940

THE MARITIME HERITAGE COLLECTION PART TWO

But first we had to pass through the canal's narrow-looking entrance lock - a delicate procedure for a ship which is 270m long and more than 32m wide.